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A man in China bought a first mass ticket an
China Eastern Airlines, went to the airport every day
tor almost a year, ate food for free at their lounge,
changed his ticket for the next day after eating
about 300 times, then cancelled his ticket for
a full refund before validity expired.

My favorite story like this was a guy who would order money from the US Mint on his credit card. Back then the US Mint didn't charge any extra money; if you bought $20 worth of quarters or something, it cost exactly $20, so no money is lost. A guy did this with his credit card and accumulated millions of skymiles rewards, so he had hundreds of free flights.

that's what it means by "Changed his ticket for the next day." To illustrate:

June 12th
-Arrive at airport with ticket for a June 12th flight
-get past security etc.
-go to lounge where free food awaits (aside: Airports have free food in China? In America the food is more expensive at an Airport)
-finish eating
-cancel June 12th flight, reschedule for a June 13th flight
-repeat
.....
-Day before validity expires
-perform normal routine
-cancel ticket entirely for full refund rather than rescheduling.